By Institution of Mechanical Engineers

This publication provides the papers from the tenth foreign convention on Vibrations in Rotating equipment. This convention, first held in 1976, has outlined and redefined the cutting-edge within the many elements of vibration encountered in rotating equipment. amazing via a superb mixture of business and educational participation accomplished, those papers current the most recent tools of theoretical, experimental and computational rotordynamics, along the present problems with hindrance within the extra improvement of rotating machines. subject matters are geared toward propelling ahead the criteria of excellence within the layout and operation of rotating machines.

  • Presents most modern tools of theoretical, experimental and computational rotordynamics
  • Covers present problems with trouble within the extra improvement of rotating machines

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Additional info for 10th International Conference on Vibrations in Rotating Machinery: 11-13 September 2012, Imeche London, UK

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El-Saeidy and Sticher [14] obtained the responses of a rigid rotor-bearing system subjected to rotating mass unbalance plus harmonic support excitations. Das et al. [15] investigated the active vibration control of a flexible rotor system excited by mass unbalance and periodic rotational motion of the support. Among all the literature mentioned above, there are references studying support-excited rotor systems and whose few works dealt with the harmonically excited on-board rotors [12-15]. Moreover, these references concentrated on the investigation of dynamic behavior of either simple rotors, rotors supported by elastic bearings with constant damping and stiffness coefficients or rotors excited by simple support motions.

Moreover the aerodynamically shaped parts in the airflow within the engine also cover dynamically sensitive and interesting parts such as bearings and dampers. In this way the aerodynamic design hinders direct measurement at these locations. Several of the main components of the test rig have been adapted for the reasons given. The following sections cover some of these components and the major designs. 1 Rotors and Propulsion The most important parts of the test rig are the rotors. Most of the other components such as bearings, seals or the casing depend mainly on the rotor’s design.

14). In order to enhance the detectability of asymmetry, despite the fact that the systems have zero unbalance, an externally applied torque of the form Q e  Qe sin t e1  Qe cos t e3 unbalance is applied. Figure 14. Left: Asymmetric disc mounted on a flexible massless shaft; Right: Anisotpric, massless shaft with a symmetric disc at its middle The two systems can be modelled by a linear time invariant equation of motion (LTI EoM) in terms of the disc angular deflections around e1 , e2 . (26)), the steady state response in inertial CS is characterized by two frequencies.

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